In January 1933 Adolf Hitler was appointed chancellor of Germany and before August of the same year Germany was declared a one-party state.

The smallest prime (emirp) whose the sum and the product of
digits are equal to the same powers of consecutive primes
(16=2^4, 81=3^4). Note that the sum plus the product of
these digits is equal to the largest double-digit prime
(emirp). [Loungrides]

The only year of the 20th century to divide a repunit prime with no more than 21 digits: 111111111111111111111 = 3 * 37 * 43 * 239 * 1933 * 4649 * 10838689. It therefore divides the repunit prime with 2*21 = 42 digits. [Post]

Inauguration Day in the United States occurred on March 4
from 1798 up to the emirp year 1933 when Franklin D.
Roosevelt was inaugurated President. Since then
Inauguration Day has been on January 20. Furthermore, 3041933
(3/04/1933) is prime. [Green]